0
middle
main-window-combobox-row
main-window-append-row-button
main-window-insert-row-button
main-window-replace-row-button
main-window-delete-row-button
main-window-reset-button
main-window-shuffle-button
combobox-label
combobox-element
2
append-row-button
2
insert-row-button
2
replace-row-button
2
delete-row-button
2
reset-button
2
shuffle-button